Binder folder



Julv 6, 1943. K P; HARTMANN 2323393 BINDER FOLDER Filed Dec. 1.3, 1941 PA UL HA R TMA NN INVENTOR ATTORNEYS Patented July 6, 1943 UNETED STATES PTENTjOFFlCE.

Application December 13, 1941, Serial No. 422,784

2 Claims.

This invention relates to devices for connecting a plurality of loose leaves, pages, sheets, etc., in assembled relation, generally known as loose leaf binders.

Binders made of metal, as is common, consist of pliable strips, easily bendable, adapted to retain the shape which they are ultimately given, and are substantially non-resilient; due to their opacity, the parts may obscure marginal portions of the pages which should be visible; by reason of the inherent tendency of metal to corrode, at least the outer leaves frequently become blemished and stained by contact; and, finally the cost of production is excessive.

It is therefore an object of the present invention to provide a binder in which each and every of the foregoing undesirable characteristics are completely eliminated, the device being highly resilient, positively non-corrodible, and inexpensive to manufacture.

A further feature is in the provison of a binder which requires less than the usual number of perforations in the pages, hence less destructive disgurement.

Another purpose is to produce a binder not subject to deterioration by repeated use, and which, due to its simplicity, occupies but a fraction of the space required by metallic binders.

These and other analogous aims are accomplished by the novel and practical construction, combination and arrangement of few and simple parts, hereinafter described and illustrated in the accompanying drawing, constituting a graphical component of this disclosure, and in which- Figure 1 is a perspective view. of a common Commercial folder in an open position showing a form of binder in operative position.

Figure 2 is a fragmentary transverse sectional view looking on line 2-2 of Figure 1.

Figure 3 is a longitudinal sectional view looking on line 3-3 of Figure 1.

Figure 4 is a perspective view delineating a modification of the binder device.

Figure 5 is a transverse sectional view looking on line 5-5 of Figure 4.

Figure 6 is a perspective view of the keeper strip used in the binders shown in Figs. l and 4.

Figure 7 is a perspective view of the binder element used in connection therewith.

In the drawing the numeral IS designates the papers to be secured, these papers being provided with perforations l'l adapted to receive the end elements [9 of a keeper strip l8, these ends being reduced in conformity with the size of the perforations. Figures 1 to 3 show an ordinary commercial folder 23, made of Manilla or other like strong fibrous material, indicated as folded lengthwise, as at the folds 24.

A-n elongated rectangular tab 25, of cardboard or the like, in length substantially equal to that of the keeper strip la, and approximately three times its Width, is creased longitudinally, as at 26 and 21, to produce three strips, respectively 28, 29 and 30, the strips 28 and 29 forming a fiap, and the strip 30 being shorter, due to uniform reduction of its ends and all are supplied on one side with an adhesive 3l; the crease connected, shorter portion or base strip 30 is provided with a single pair of spaced perforations 32, conforming to the perforations H in the leaves IG.

The intermediate, full length strip 29 has formed through it an inner pair of perforations 33 in register with the perforations 32 and a pair of perforations 34 outwardly therebeyond.

The outer strip 28 is provided with perforations 35, in register with the perforations 32 and 33, and an outer pair of perforations 36 in register with the perforations 34.

As seen in Figs. 1 to 3, the tab or base strip 30 is attached by its adhesive, to the inner surface of the folder 23, in spaced parallel relation to the folds 24 or, if preferred, the tab may be applied to the folder adjacent its upper margin; the strip 30 is caused to adhere to the inner surface of the folder 23 and the strip 23 folded and adhered to the adjacent strip 28 to form a flap.

The tangs l9 of the keeper strip are passed through the perforations l'l of the leaves, continued through the inner pairs of perforations 33 and 35, thence oppositely outward, and finally turned re-entrantly through the outer perforations 34 and 36 to extend between the inner adjacent surfaces of the lowermost of the inserted leaves and the strip 29, occupying an inconsiderable space and presenting no projections that might interfere or become entangled with adjacent objects.

In Figs. 4 and 5 the leaves are bound without a folder. The base strip 30 is folded over and adhered to the strip 28, which is folded along the crease 26 over the gummed strip 29.

In this case, the tangs |9 are passed downwardly through the perforations 32, 33 and 35, turned outwardly and thence upwardly through the perforations 34 and 36, thence straight outwardly under the lowermost of the leaves.

It Will be further understood that, due to the nature of the plastic material used, the papers and cover will not be stained or otherwise disfigured by it. Again, that the device may be repeatedly used, with a varying number of leaves, from one to fifty average sheets, and is far less liable to breakage than metal strips, by reason of its greater ductility.

Having thus described the invention and set forth the manner of its construction and application, what is claimed as new and sought to secure by Letters Patent is:

l. A binding assembly for papers comprising, a tab folder to produce a base strip having an adhesve on its inner side .by which it may be secured to a sheet and a flap having inner and outer pairs of perforations, the paper being perforated in register with the perforations in said flap, and a thin flat strip of resilient material adapted to be nserted downwardly through the perforations in the papers and said flap and then bent to extend upwardly through the outer pair of perforations in said flap and thence level outwardly therefrom.

` 2. A binding assembly for papers comprising, a tab folded to produce a gummed base strip and a flap having spaced perforations, said flap having v perforations in accord with the base strip perforations, the papers being perforated in accord .with said base strip, and a thin flat flexible strip PAUL HAR'I'MANN. 

